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Nicola Thorp was told in December 2015 that her shoes were unacceptable for a temporary assignment in London with finance firm PwC.

Her employment agency, Portico, had a dress code specifying that female workers must wear non-opaque tights, have hair with "no visible roots," wear "regularly re-applied" makeup — and appear in shoes with a heel between 2 to 4 inches (5 to 10 centimeters) high.

For Thorp, that was a step too far.

She started an online petition, calling formal workplace dress codes "outdated and sexist." It has gathered more than 150,000 signatures, making it eligible for a debate in Parliament.

Thorp told the BBC that "dress codes should reflect society."

"Twenty years ago, women weren't allowed to wear trousers in the same role that I'm doing now," she said. "And it's only because some women spoke up about that and said, 'We feel like we have a right to wear trousers,' that that's changed."

Monday's debate is non-binding, but the political pressure for companies to scrap mandatory high heels is building. British law forbids companies from discriminating against women, but Parliament's Women and Equalities Committee said in a report sparked by Thorp's experience that "discriminatory dress codes" remain commonplace.

The lawmakers said they heard from hundreds of women "who told us about the pain and long-term damage caused by wearing high heels for long periods in the workplace, as well as from women who had been required to dye their hair blonde, to wear revealing outfits and to constantly reapply makeup."

The committee also heard from the College of Podiatry, which said women who wear high heels for long periods of time have "reduced balance, reduced ankle flexion and weaker muscle power in the calf," and are prone to disabling pain.

The committee urged the government to enforce existing laws against discrimination and impose higher fines on companies that break the rules.

In response to Thorp's petition, the government said the law already specifies that dress codes must be reasonable and "make equivalent requirements for men and women."

"Employers should not be discriminating against women in what they require them to wear," the government said.

Thorp's petition has already caused one change. Portico announced last year it was amending its policy to adopt a gender-neutral dress code and to allow workers to wear flat shoes if they prefer.